// values are in mm
cave
BOX
air
 200000  -200000  -200000
 200000   200000  -200000
-200000   200000  -200000
-200000  -200000  -200000
 200000  -200000   200000
 200000   200000   200000
-200000   200000   200000
-200000  -200000   200000
